Started URL management docs

docs/guide/url.md

 URL Management
 ==============
 
+The concept of URL management in Yii fairly simple. The idea is that application uses internal routes and parameters
+everywhere. Framework takes care of translating routes into URLs and back according to URL manager configuration.
+This approach allows you to adjust URLs in a single config file without touching application code.
+
+Internal route
+--------------
+
+Internal routes and parameters are what you're dealing with when implementing an application usuing Yii.
+
+Each controller and its action has a corresponding internal route such as `site/index`. Here `site` is referred to as
+controller ID while `test` is referred to as action ID. If controller belongs to a module, internal route is prefixed
+with the module ID such as `blog/post/index` for a blog module.
+
+Creating URLs
+-------------
+
+As was already mentioned, the most important rule is to always use URL manager to create URLs. Url manages is an
+application component with `urlManager` id that is accessible both from web and console applications via
+`\Yii::$app->urlManager` and has two following URL creation methods availabe:
+
+- createUrl($route, $params = [])
+- createAbsoluteUrl($route, $params = [])
+
+First one creates URL relative to the application root while the second one creates URL prefixed with protocol and
+hostname. The former is suitable for internal application URLs while the latter is used when you need to create rules
+for outside the website. For example, when sending emails or generating RSS feed.
+
+Some examples:
+
+```php
+echo \Yii::$app->urlManager->createUrl('site/page', ['id' => 'about']);
+echo \Yii::$app->urlManager->createAbsoluteUrl('blog/post/index');
+```
+
+Inside web application controller you can use its own `createUrl` shortcut method in the following forms:
+
+```php
+echo $this->createUrl(''); // currently active route
+echo $this->createUrl('view', ['id' => 'contact']); // same controller, different action
+echo $this->createUrl('post/index'); // same module, different controller and action
+echo $this->createUrl('/site/index'); // absolute route no matter which controller we're in
+```
+
+> **Tip**: In order to generate URL with a hashtag, for example `/index.php?r=site/page&id=100#title`, you need to
+  specify parameter named `#` using `$this->createUrl('post/read', ['id' => 100, '#' => 'title'])`.
+
+Customizing URLs
+----------------
+
+By default Yii uses a query string format URLs such as `/index.php?r=news/view&id=100`. In order to make URLs
+human-friendly you need to configure `urlManager` component like the following:
+
+```php
+<?php
+return [
+	// ...
+	'components' => [
+		'urlManager' => [
+			'enablePrettyUrl' => true,
+			'showScriptName' => false,
+		],
+	],
+];
+```
+
+Note that
+
+### Named parameters
+
+### Handling subdomains
+
+### Faking URL Suffix
+
+```php
+<?php
+return [
+	// ...
+	'components' => [
+		'urlManager' => [
+			'suffix' => '.html',
+		],
+	],
+];
+```
+
+### Handling REST
+
+
+URL parsing
+-----------
+
+Complimentary to creating URLs Yii is handling transforming custom URLs back into internal route and parameters.
+
+### Strict URL parsing
+
+By default if there's no custom rule for URL and URL matches default format such as `/site/page` Yii tries to run a
+corresponding controller's action. This beahvior coule be disabled so if there's no custom rule match, a 404 not found
+error will be produced immediately.
+
+```php
+<?php
+return [
+	// ...
+	'components' => [
+		'urlManager' => [
+			'enableStrictParsing' => true,
+		],
+	],
+];
+```
+
+Creating your own rule classes
+------------------------------